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Properties

Label 20.16.4134875196...9568.3
Degree $20$
Signature $[16, 2]$
Discriminant $2^{42}\cdot 7^{9}\cdot 13^{12}$
Root discriminant $47.95$
Ramified primes $2, 7, 13$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 20T633

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![7, 0, -62, 0, -495, 0, 2418, 0, -2374, 0, -146, 0, 1381, 0, -820, 0, 208, 0, -24, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^20 - 24*x^18 + 208*x^16 - 820*x^14 + 1381*x^12 - 146*x^10 - 2374*x^8 + 2418*x^6 - 495*x^4 - 62*x^2 + 7)
 
gp: K = bnfinit(x^20 - 24*x^18 + 208*x^16 - 820*x^14 + 1381*x^12 - 146*x^10 - 2374*x^8 + 2418*x^6 - 495*x^4 - 62*x^2 + 7, 1)
 

Normalized defining polynomial

\( x^{20} - 24 x^{18} + 208 x^{16} - 820 x^{14} + 1381 x^{12} - 146 x^{10} - 2374 x^{8} + 2418 x^{6} - 495 x^{4} - 62 x^{2} + 7 \)

magma: DefiningPolynomial(K);
 
sage: K.defining_polynomial()
 
gp: K.pol
 

Invariants

Degree:  $20$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[16, 2]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(4134875196314770784334479588589568=2^{42}\cdot 7^{9}\cdot 13^{12}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $47.95$
magma: Abs(Discriminant(Integers(K)))^(1/Degree(K));
 
sage: (K.disc().abs())^(1./K.degree())
 
gp: abs(K.disc)^(1/poldegree(K.pol))
 
Ramified primes:  $2, 7, 13$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is not Galois over $\Q$.
This is not a CM field.

Integral basis (with respect to field generator \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $\frac{1}{26} a^{12} + \frac{1}{26} a^{10} - \frac{3}{26} a^{8} - \frac{9}{26} a^{6} - \frac{7}{26} a^{4} - \frac{3}{13} a^{2} + \frac{11}{26}$, $\frac{1}{26} a^{13} + \frac{1}{26} a^{11} - \frac{3}{26} a^{9} - \frac{9}{26} a^{7} - \frac{7}{26} a^{5} - \frac{3}{13} a^{3} + \frac{11}{26} a$, $\frac{1}{26} a^{14} - \frac{2}{13} a^{10} - \frac{3}{13} a^{8} + \frac{1}{13} a^{6} + \frac{1}{26} a^{4} - \frac{9}{26} a^{2} - \frac{11}{26}$, $\frac{1}{26} a^{15} - \frac{2}{13} a^{11} - \frac{3}{13} a^{9} + \frac{1}{13} a^{7} + \frac{1}{26} a^{5} - \frac{9}{26} a^{3} - \frac{11}{26} a$, $\frac{1}{52} a^{16} - \frac{1}{52} a^{15} - \frac{1}{52} a^{14} - \frac{1}{52} a^{13} + \frac{3}{52} a^{11} - \frac{6}{13} a^{10} + \frac{9}{52} a^{9} + \frac{11}{26} a^{8} + \frac{7}{52} a^{7} - \frac{11}{52} a^{6} + \frac{3}{26} a^{5} + \frac{7}{26} a^{4} - \frac{11}{52} a^{3} - \frac{1}{2} a + \frac{3}{52}$, $\frac{1}{52} a^{17} - \frac{1}{52} a^{13} - \frac{1}{52} a^{12} + \frac{23}{52} a^{11} + \frac{25}{52} a^{10} + \frac{19}{52} a^{9} - \frac{23}{52} a^{8} - \frac{17}{52} a^{6} + \frac{11}{26} a^{5} - \frac{19}{52} a^{4} + \frac{23}{52} a^{3} - \frac{5}{13} a^{2} + \frac{7}{52} a - \frac{11}{52}$, $\frac{1}{51532} a^{18} + \frac{213}{25766} a^{16} + \frac{645}{51532} a^{14} - \frac{1}{52} a^{13} - \frac{933}{51532} a^{12} + \frac{25}{52} a^{11} + \frac{17571}{51532} a^{10} - \frac{23}{52} a^{9} + \frac{4611}{12883} a^{8} - \frac{17}{52} a^{7} + \frac{53}{991} a^{6} - \frac{19}{52} a^{5} + \frac{4859}{51532} a^{4} - \frac{5}{13} a^{3} - \frac{6037}{51532} a^{2} - \frac{11}{52} a - \frac{9605}{25766}$, $\frac{1}{51532} a^{19} + \frac{213}{25766} a^{17} + \frac{645}{51532} a^{15} - \frac{1}{52} a^{14} - \frac{933}{51532} a^{13} - \frac{1}{52} a^{12} + \frac{17571}{51532} a^{11} + \frac{3}{52} a^{10} + \frac{4611}{12883} a^{9} + \frac{9}{52} a^{8} + \frac{53}{991} a^{7} + \frac{7}{52} a^{6} + \frac{4859}{51532} a^{5} + \frac{3}{26} a^{4} - \frac{6037}{51532} a^{3} - \frac{11}{52} a^{2} - \frac{9605}{25766} a - \frac{1}{2}$

magma: IntegralBasis(K);
 
sage: K.integral_basis()
 
gp: K.zk
 

Class group and class number

Trivial group, which has order $1$ (assuming GRH)

magma: ClassGroup(K);
 
sage: K.class_group().invariants()
 
gp: K.clgp
 

Unit group

magma: UK, f := UnitGroup(K);
 
sage: UK = K.unit_group()
 
Rank:  $17$
magma: UnitRank(K);
 
sage: UK.rank()
 
gp: K.fu
 
Torsion generator:  \( -1 \) (order $2$)
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
sage: UK.torsion_generator()
 
gp: K.tu[2]
 
Fundamental units:  Units are too long to display, but can be downloaded with other data for this field from 'Stored data to gp' link to the right (assuming GRH)
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 22041268730.1 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

20T633:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 40960
The 124 conjugacy class representatives for t20n633 are not computed
Character table for t20n633 is not computed

Intermediate fields

\(\Q(\sqrt{2}) \), 5.5.6889792.1, 10.10.379753870426112.1

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Sibling fields

Degree 20 siblings: data not computed
Degree 40 siblings: data not computed

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type R ${\href{/LocalNumberField/3.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/5.8.0.1}{8} }{,}\,{\href{/LocalNumberField/5.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/5.2.0.1}{2} }^{2}$ R ${\href{/LocalNumberField/11.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/11.4.0.1}{4} }$ R ${\href{/LocalNumberField/17.10.0.1}{10} }{,}\,{\href{/LocalNumberField/17.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/19.8.0.1}{8} }{,}\,{\href{/LocalNumberField/19.4.0.1}{4} }^{3}$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/23.2.0.1}{2} }^{5}{,}\,{\href{/LocalNumberField/23.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/29.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/29.2.0.1}{2} }^{6}$ ${\href{/LocalNumberField/31.4.0.1}{4} }^{4}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/37.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/37.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/41.8.0.1}{8} }{,}\,{\href{/LocalNumberField/41.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/41.1.0.1}{1} }^{4}$ $20$ ${\href{/LocalNumberField/47.8.0.1}{8} }{,}\,{\href{/LocalNumberField/47.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/47.2.0.1}{2} }{,}\,{\href{/LocalNumberField/47.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/53.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/53.2.0.1}{2} }^{6}$ ${\href{/LocalNumberField/59.8.0.1}{8} }^{2}{,}\,{\href{/LocalNumberField/59.2.0.1}{2} }^{2}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

magma: p := 7; // to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
magma: idealfactors := Factorization(p*Integers(K)); // get the data
 
magma: [<primefactor[2], Valuation(Norm(primefactor[1]), p)> : primefactor in idealfactors];
 
sage: p = 7; # to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
sage: [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
gp: p = 7; \\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
gp: idealfactors = idealprimedec(K, p); \\ get the data
 
gp: vector(length(idealfactors), j, [idealfactors[j][3], idealfactors[j][4]])
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
2Data not computed
$7$7.2.1.2$x^{2} + 14$$2$$1$$1$$C_2$$[\ ]_{2}$
7.2.0.1$x^{2} - x + 3$$1$$2$$0$$C_2$$[\ ]^{2}$
7.8.4.1$x^{8} + 14 x^{6} + 539 x^{4} + 343 x^{2} + 60025$$2$$4$$4$$C_4\times C_2$$[\ ]_{2}^{4}$
7.8.4.1$x^{8} + 14 x^{6} + 539 x^{4} + 343 x^{2} + 60025$$2$$4$$4$$C_4\times C_2$$[\ ]_{2}^{4}$
$13$13.4.0.1$x^{4} + x^{2} - x + 2$$1$$4$$0$$C_4$$[\ ]^{4}$
13.8.6.1$x^{8} - 13 x^{4} + 2704$$4$$2$$6$$C_4\times C_2$$[\ ]_{4}^{2}$
13.8.6.1$x^{8} - 13 x^{4} + 2704$$4$$2$$6$$C_4\times C_2$$[\ ]_{4}^{2}$